a.The 4-20 mA current loop is the dominant standard in many industries.
b.It is the simplest option to connect and configure.
c.It uses less wiring and connections than other signals, greatly reducing initial setup costs.
d.Better for traveling long distances, as current does not degrade over long connections like voltage.
e.It is less sensitive to background electrical noise.
f.Since 4 mA is equal to 0% output, it is incredibly simple to detect a fault in the system.